<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>添加商品</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图区域 -->
		<el-card>
			<!-- 提示区域 -->
			<el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
			<!-- 进度条区域 -->
			<!-- 进度条和tab栏通过activeName进行联动 -->
			<el-steps :space="300" :active="activeIndex - 0" finish-status="success" align-center>
				<el-step title="基本信息"></el-step>
				<el-step title="商品参数"></el-step>
				<el-step title="商品属性"></el-step>
				<el-step title="商品图片"></el-step>
				<el-step title="商品内容"></el-step>
				<el-step title="完成"></el-step>
			</el-steps>
			<!-- tab栏区域 -->
			<el-form
				:model="addForm"
				:rules="addFormRules"
				ref="addFormRef"
				label-width="100px"
				label-position="top"
			>
				<el-tabs
					v-model="activeIndex"
					:tab-position="'left'"
					style="height: 100%"
					:before-leave="beforeTabLeave"
					@tab-click="tabClicked"
				>
					<el-tab-pane label="基本信息" name="0">
						<el-form-item label="商品名称" prop="goods_name">
							<el-input v-model="addForm.goods_name"></el-input>
						</el-form-item>
						<el-form-item label="商品价格" prop="goods_price">
							<el-input v-model="addForm.goods_price" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品重量" prop="goods_weight">
							<el-input v-model="addForm.goods_weight" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品数量" prop="goods_number">
							<el-input v-model="addForm.goods_number" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品分类" prop="goods_cat">
							<el-cascader
								expand-trigger="hover"
								v-model="addForm.goods_cat"
								:options="cateList"
								:props="cateProps"
								@change="handleChange"
							></el-cascader>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品参数" name="1">
						<!-- 渲染表单的item项 -->
						<el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
							<!-- 复选框组 -->
							<el-checkbox-group v-model="item.attr_vals">
								<el-checkbox
									:label="cb"
									v-for="(cb, i) in item.attr_vals"
									:key="i"
									border
								></el-checkbox>
							</el-checkbox-group>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品属性" name="2">
						<el-form-item v-for="item in onlyTableData" :key="item.attr_id" :label="item.attr_name">
							<el-input v-model="item.attr_vals"></el-input>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品图片" name="3">
						<!-- action表示图片上上传到的后台api接口地址 -->
						<el-upload :headers="headerObj"
							:action="uploadURL"
							:on-preview="handlePreview"
							:on-remove="handleRemove"
							list-type="picture" :on-success="handleSuccess"
						>
							<el-button size="small" type="primary">点击上传</el-button>
						</el-upload>
					</el-tab-pane>
					<el-tab-pane label="商品内容" name="4">
						<!-- 富文本编辑器 -->
						<quill-editor v-model="addForm.goods_introduce">
						</quill-editor>
						<!-- 添加商品的按钮 -->
						<el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
					</el-tab-pane>
				</el-tabs>
			</el-form>
		</el-card>

		<!-- 图片预览 -->
		<el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
			<img :src="previewPath" alt="" class="previewImg">
		</el-dialog>
	</div>
</template>

<script>

import _ from 'lodash'

export default {
	data() {
		return {
			// 进度条和tab页的联动索引值
			activeIndex: '0',
			// 添加商品的表单数据对象
			addForm: {
				goods_name: '',
				goods_price: 0,
				goods_weight: 0,
				goods_number: 0,
				// 商品所属的分类数组
				goods_cat: [],
				// 图片的数组
				pics: [],
				// 商品介绍
				goods_introduce: '',
				attrs: []
			},
			// 添加商品验证规则的对象
			addFormRules: {
				goods_name: [{ required: true, message: '请输入商品名称！', trigger: 'blur' }],
				goods_price: [{ required: true, message: '请输入商品价格！', trigger: 'blur' }],
				goods_weight: [{ required: true, message: '请输入商品重量！', trigger: 'blur' }],
				goods_number: [{ required: true, message: '请输入商品数量！', trigger: 'blur' }],
				goods_cat: [{ required: true, message: '请选择商品分类！', trigger: 'blur' }]
			},
			// 商品分类列表
			cateList: [],
			// 级联选择器
			cateProps: {
				label: 'cat_name',
				value: 'cat_id',
				children: 'children'
			},
			// 动态参数列表数据
			manyTableData: [],
			// 静态属性列表数据
			onlyTableData: [],
			// 上传图片的API接口地址
			uploadURL: 'http://127.0.0.1:8080/api/private/v1/upload/',
			// 图片上传组件的headers请求头对象
			headerObj: {
				Authorization: window.sessionStorage.getItem('token')
			},
			// 触发预览事件时为其赋值
			previewPath: '',
			// 控制图片预览对话框的显示与隐藏
			previewVisible: false,
			
		};
	},
	created() {
		this.getCateList();
	},
	methods: {
		// 获取所有商品分类数据
		async getCateList() {
			const { data: res } = await this.$http.get('categories');
			if (res.meta.status !== 200) {
				return this.$message.error('获取商品分类数据失败！');
			}
			this.cateList = res.data;
		},
		// 级联选择器选中项变化时触发
		handleChange() {
			if (this.addForm.goods_cat.length !== 3) {
				this.addForm.goods_cat = [];
			}
		},
		// 监听tab页的切换
		beforeTabLeave(activeName, oldActiveName) {
			if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
				this.$message.error('请先选择商品分类！');
				return false;
			}
		},
		// 点击tab栏中的分页时触发
		async tabClicked() {
			// 证明访问的是动态参数
			if (this.activeIndex === '1') {
				const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
					params: {
						sel: 'many'
					}
				});
				if (res.meta.status !== 200) {
					return this.$message.error('获取动态参数信息失败！');
				}
				res.data.forEach(item => {
					item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ');
				});
				this.manyTableData = res.data;
			}
			// 证明访问的是静态属性面板
			else if (this.activeIndex === '2') {
				const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
					params: {
						sel: 'only'
					}
				});
				if (res.meta.status !== 200) {
					return this.$message.error('获取静态属性失败！');
				}
				this.onlyTableData = res.data;
			}
		},
		// 处理图片预览效果
		handlePreview(file) {
			console.log(file.response.data);
			this.previewPath = file.response.data.url;
			this.previewVisible = true;
		},
		// 处理移除图片的操作
		handleRemove(file) {
			// 1、获取将要删除的图片的临时路径
			const filePath = file.response.data.tmp_path;
			// 2、从pics数组中，找到这个图片对应的索引值
			const i = this.addForm.pics.findIndex(x => x.pic === filePath);
			// 3、调用数组的 splice方法，把图片信息对象从pics数组中移除
			this.addForm.pics.splice(i, 1);
		},
		// 监听图片上传成功的事件
		handleSuccess(response) {
			// 1、拼接得到一个图片信息对象
			const picInfo = { pic: response.data.tmp_path }
			// 2、将图片信息对象push到pics数组中
			this.addForm.pics.push(picInfo);
		},
		// 添加商品按钮触发事件
		add() {
			this.$refs.addFormRef.validate(async valid => {
				if(!valid) {
					return this.$message.error('请填写必要的表单项！');
				}
				// 执行添加的业务逻辑
				// 这里addForm要求字符串，双向数据绑定要求的是数组，发生了冲突
				// lodash  深拷贝 cloneDeep(obj)
				const form = _.cloneDeep(this.addForm)
				form.goods_cat = form.goods_cat.join(',');
				// 处理动态参数
				this.manyTableData.forEach(item => {
					const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')};
					this.addForm.attrs.push(newInfo);
				});
				// 处理静态属性
				this.onlyTableData.forEach(item => {
					const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
					this.addForm.attrs.push(newInfo);
				});
				form.attrs = this.addForm.attrs;

				// 发起请求，添加商品
				// 商品的名称必须是维一的
				const {data: res} = await this.$http.post('goods', form);

				if(res.meta.status !== 201) {
					return this.$message.error('添加商品失败！');
				}
				this.$message.success('添加商品成功！');
				this.$router.push('/goods');
			})
		}

	},
	computed: {
		cateId() {
			if (this.addForm.goods_cat.length === 3) {
				return this.addForm.goods_cat[2];
			}
			return null;
		}
	}
};
</script>

<style lang="less" scoped>
.el-steps {
	margin: 30px 0;
}

.el-checkbox {
	margin: 0 10px 0 0 !important;
}

.previewImg {
	width: 100%
}

.btnAdd {
	margin: 20px 0;
}
</style>